Composition for dyeing keratinous fibers containing a paraphenylenediamine substituted by a diazacycloheptane radical

ABSTRACT

The subject of the invention is a composition for the oxidation dyeing of keratinous fibres, in particular human hair, comprising an oxidation base of the para-phenylenediamine type, substituted with a diazacycloheptane radical. The invention also relates to the method for dyeing fibres using this composition, and the novel compounds of the type mentioned above.

The subject of the invention is a composition for the oxidation dyeing of keratinous fibres, in particular human hair, comprising an oxidation base of the para-phenylenediamine type, substituted with a diazacycloheptane radical. The invention also relates to the method for dyeing fibres using this composition, and the novel compounds of the type mentioned above.

It is known to dye keratinous fibres, and in particular human hair, with dyeing compositions containing oxidation dye precursors, generally called oxidation bases, such as ortho- or para-phenylenediamines, ortho- or para-aminophenols and heterocyclic compounds. These oxidation bases are colourless or weakly coloured compounds which, combined with oxidizing products, can give rise, by a process of oxidative condensation, to coloured compounds.

It is also known that the shades obtained with these oxidation bases can be varied by combining them with colour modifiers, generally called couplers, the latter being chosen in particular from aromatic meta-diamines, meta-aminophenols, meta-diphenols and certain heterocyclic compounds such as indole compounds.

The variety of the molecules used in oxidation bases and couplers makes it possible to obtain a rich palette of colours.

The so-called “permanent” colour obtained using these oxidation dyes must moreover meet a number of requirements. Thus, it must be without drawbacks from the toxicological point of view, it must make it possible to obtain shades in the desired intensity and exhibit good resistance to external agents such as light, adverse weather conditions, washing, permanent waving, perspiration and rubbing.

The dyes must also make it possible to cover grey hair, and be the least selective possible, that is to say make it possible to obtain the smallest possible differences in colour right along the same keratinous fibre, which may indeed be differently sensitized (i.e. damaged) between its tip and its root.

It is already known to use 1,4-diazacycloheptane derivatives for the oxidation dyeing of keratinous fibres. For example, Patent U.S. Pat. No. 6,165,230 describes a dyeing composition containing 1,4-diazacycloheptane derivatives substituted on both nitrogen atoms of the ring by an aminobenzene group which makes it possible to obtain intense colorations.

The aim of the present invention is to provide novel compositions for dyeing keratinous fibres, which do not exhibit the disadvantages of those of the prior art. In particular, the aim of the present invention is to provide compositions which contain dyes which are intense, not very selective and particularly resistant, while being capable of generating intense colorations in varied shades, in particular in the basic shades.

This aim is achieved with the present invention whose subject is a composition for the oxidation dyeing of keratinous fibres comprising an oxidation base of the following formula (I) and/or the corresponding addition salts:

in which:

-   -   R₁ represents     -   a halogen atom, preferably chlorine or bromine;     -   a linear or branched C₁-C₆ hydrocarbon chain, which is saturated         or which may contain one or more double bonds and/or one or more         triple bonds, which may form a 3- to 6-membered ring, it being         possible for one or more carbon atoms to be replaced by an         oxygen, nitrogen or sulphur atom, by an SO₂ group, or, when the         carbon is terminal, by a halogen atom, preferably a chlorine or         bromine atom; the said radical R₁ not containing a peroxide         bond, or a diazo, nitro or nitroso radical;     -   n is between 0 and 4 inclusive, it being understood that when n         is greater than or equal to 2, then the radicals R₁ may be         identical or different,     -   R₂ represents     -   a hydrogen atom;     -   an alkyl radical which may be unsaturated, unsubstituted or         substituted with one or more carboxyl radicals, alkylcarbonyl         radicals, alkoxycarbonyl radicals, carbamoyl radicals, mono- or         dialkylcarbamoyl radicals, saturated and/or unsaturated,         nitrogen-oxygen- and/or sulphur-containing heterocyclic radicals         containing 4, 5, 6 or 7 atoms;     -   an alkyl radical which may be unsaturated, substituted at the         2-position or more by one or more hydroxyl radicals, alkoxy         radicals, amino radicals, mono- or dialkylamino radicals, thiol         radicals or halogen atoms;     -   an alkylcarbonyl radical;     -   an alkoxycarbonyl radical;     -   a mono- or dialkylcarbamoyl radical;     -   a carbamoyl radical;     -   a radical R₆R₇N—C═NR₅— where R₅, R₆, and R₇ represent hydrogen,         a C₁-C₄ alkyl radical or a hydroxyalkyl radical, preferably R₅         is hydrogen and R6 and R₇ are chosen from hydrogen or a methyl,     -   R₃ represents     -   a hydrogen atom,     -   an alkyl radical which may be unsaturated;     -   a hydroxyl radical;     -   a hydroxyalkyl radical;     -   an alkoxy radical;     -   an alkoxyalkyl radical;     -   an alkylcarbonyl radical;     -   a hydroxyalkoxyalkyl radical;     -   an amino radical;     -   a monoalkylamino or dialkylamino radical;     -   an aminoalkyl radical, it being possible for the amine to be         mono- or disubstituted with an alkyl, acetyl or hydroxyalkyl         radical;     -   a hydroxy- or aminoalkyl radical;     -   a carboxyl radical;     -   a carboxyalkyl radical;     -   a carbamoyl radical;     -   a carbamoylalkyl radical;     -   an alkoxycarbonyl radical;     -   a mono- or dialkylaminocarbonyl radical;     -   R₄ represents     -   an alkyl radical which may be unsaturated;     -   a hydroxyalkyl radical;     -   an alkoxyalkyl radical;     -   an alkylcarbonyl radical;     -   a hydroxyalkoxyalkyl radical;     -   an aminoalkyl radical, it being possible for the amine to be         mono- or disubstituted with an alkyl, acetyl or hydroxyalkyl         radical;     -   a hydroxy- and aminoalkyl radical;     -   a carboxyl radical;     -   a carboxyalkyl radical;     -   a carbamoyl radical;     -   a carbamoylalkyl radical;     -   an alkoxycarbonyl radical;     -   a mono- or dialkylaminocarbonyl radical;     -   m is between 0 and 4 inclusive, it being understood that when m         is greater than or equal to 2, then the radicals R₄ may be         identical or different.

The compounds of formula (I) are para-phenylenediamines substituted with a substituent of the 1,4-diazacycloheptane type, a substituent also called in the literature 1,4-diazepan.

In the above definitions, the alkyl radicals or groups are linear or branched and comprise, unless otherwise stated, from 1 to 10 carbon atoms, preferably 1 to 6 carbon atoms. An alkoxy radical is an alkyl-O radical, the alkyl group being as defined above.

The expression unsaturated alkyl radical is understood to mean an alkyl of 2 to 10 carbon atoms and comprising one or more double and/or triple bonds.

A substituted alkyl radical is a mono- or polysubstituted alkyl. For example, a hydroxyalkyl or an aminoalkyl is an alkyl which may be substituted with one or more hydroxyl or amino groups. An alkyl radical substituted at the 2-position or more is an alkyl of formula —CH₂—R, R being a substituted alkyl.

According to the invention, when it is indicated that one or more of the carbon atoms of the radical R₁ may be replaced by an oxygen, nitrogen or sulphur atom or by an SO₂ group, and/or that the said radical R₁ may contain one or more double bonds and/or one or more triple bonds, that means that it is possible, by way of example, to carry out the following conversions:

When n is equal to 0, the benzene ring is NH₂—C₆H₄—N—.

In formula (I), when n is different from zero, the radical R₁ is for example chosen from a chlorine atom, or a methyl, ethyl, isopropyl, vinyl, allyl, methoxymethyl, hydroxymethyl, 1-carboxymethyl, 1-aminomethyl, 2-carboxyethyl, 2-hydroxyethyl, 3-hydroxypropyl, 1,2-dihydroxyethyl, 1-hydroxy-2-aminoethyl, 1-amino-2-hydroxyethyl, 1,2-diaminoethyl, methoxy, ethoxy, allyloxy or 2-hydroxyethyloxy radical.

When n is defined from zero, R₁ is preferably an alkyl, hydroxyalkyl or aminoalkyl, alkoxy, or hydroxyalkoxy radical. In this case, R₁ may be chosen from a methyl, hydroxymethyl, 2-hydroxyethyl, 1,2-dihydroxyethyl, methoxy or 2-hydroxyethoxy radical, and more preferably a methyl radical, a hydroxymethyl radical or a 1,2-dihydroxyethyl radical.

According to a preferred embodiment, the oxidation bases of formula (I) are such that n is equal to 0 or 1.

According to a particular embodiment of the invention, the radical R₂ is chosen from hydrogen, an alkyl radical, an alkyl radical substituted with a saturated or unsaturated, nitrogen-, oxygen- and/or sulphur-containing heterocyclic containing 4, 5, 6 or 7 atoms, an alkoxycarbonyl radical, an alkyl radical substituted at the 2-position or more with one or more hydroxyl radicals. In this case, R₂ may be chosen from the 2-hydroxyethyl radical, the 3-(1-pyrrolidinyl)-propyl radical, the methyl radical, the acetyl radical, hydrogen, and more preferably the 2-hydroxyethyl radical, the methyl radical or hydrogen.

According to a particular embodiment of the invention, R₃ is chosen from hydrogen, an alkyl radical, an alkyl radical substituted with one or more hydroxyl radicals, an alkyl radical substituted with one or more amino radicals, or a carboxyl radical. In this case, R₃ may be chosen from hydrogen, the hydroxyl radical, the carboxyl radical, the amino radical, the hydroxymethyl radical, or the aminomethyl radical. Among these substituents R₃ more preferably represents a hydrogen atom.

According to a particular embodiment, R₄ is chosen from hydrogen, an alkyl radical, an alkyl radical substituted with one or more hydroxyl radicals, an alkyl radical substituted with one or more amino radicals, or a carboxyl radical. R₄ preferably represents hydrogen.

The carbon substituted with R₃ or with R₄ may be of the (R) and/or (S) configuration.

The addition salts corresponding to formula (I) may be addition salts with an acid or addition salts with a base.

Among the oxidation bases of formula (I), the following compounds or their addition salts with an acid or a base may be mentioned: Formula Nomenclature

4-(4-Methyl-[1,4]diazepan- 1-yl)phenylamine

4-[1,4]Diazepan-1-yl- phenylamine

4-[4-(3-Pyrrolidin-1-yl- propyl)-[1,4]diazepan- 1-yl]phenylamine

2-[4-(4-Amino-phenyl)-[1,4]- diazepan-1-yl]ethanol

1-[4-(4-Amino-phenyl)-[1,4]- diazepan-1-yl]ethanone

4-(4-Amino-phenyl)-[1,4]- diazepane-1-carboxamidine

4-(4-Aminophenyl)-N,N- dimethyl-[1,4]diazepane-1- carboxamidine

1-(4-Amino-phenyl)-4- methyl-[1,4]-diazepan-6-ol

1-(4-Aminophenyl)-4-methyl- [1,4]-diazepan-6-ylamine

1-(4-Aminophenyl-4-(3- pyrrolidin-1-yl-propyl)- [1,4]diazepan-6-ol

1-(4-Aminophenyl)-4-(3- pyrrolidin-1-yl-propyl)- [1,4]diazepan-6-ylamine

1-(4-Aminophenyl)-4-(2- hydroxyethyl)- [1,4]diazepan-6-ol

2-[6-Amino-4-(4- aminophenyl)-[1,4]diazepan- 1-yl]ethanol

2-[4-(4-Aminophenyl)-6- hydroxymethyl)-[1,4]diazepan-1-yl]ethanol

2-Methyl-4-(4-methyl-[1,4]diazepan-1-yl)phenylamine

4-[1,4]Diazepan-1-yl-2- methyl-phenylamine

2-Methyl-4-[4-(3-pyrrolidin- 1-yl-propyl)-[1,4]diazepan- 1-yl]phenylamine

2-[4-(4-Amino-3- methylphenyl)-[1,4]diazepan- 1-yl]ethanol

1-[4-(4-Amino-3- methylphenyl)-[1,4]diazepan- 1-yl]ethanone

4-(4-Amino-3-methylphenyl)- [1,4]-diazepane-1- carboxamidine

4-(4-Amino-3-methylphenyl)- N,N-dimethyl-[1,4]- diazepane-1-carboxamidine

1-(4-Amino-3-methylphenyl)- 4-methyl-[1,4]-diazepan-6-ol

1-(4-Amino-3-methylphenyl)- 4-methyl-[1,4]-diazepan-6- ylamine

1-(4-Amino-3-methylphenyl)- 4-(3-pyrrolidin-1-yl-propyl)- [1,4]-diazepan-6-ol

1-(4-Amino-3-methylphenyl)- 4-(3-pyrrolidin-1-yl-propyl)- [1,4]-diazepan-6-ylamine

1-(4-Amino-3-methylphenyl)- 4-(2-hydroxyethyl)-[1,4]- diazepan-6-ol

2-[6-Amino-4-(4-amino-3- methyl-phenyl)-[1,4]- diazepan-1-yl]ethanol

2-[4-(4-Amino-3- methylphenyl)-6- hydroxymethyl- 1,4]diazepan-1- yl]ethanol

Preferably, the oxidation bases of formula (I) are chosen from the following compounds and their addition salts with an acid or a base

-   4-(4-Methyl-[1,4]diazepan-1-yl)phenylamine -   4-[1,4]Diazepan-1-yl-phenylamine -   4-[4-(3-Pyrrolidin-1-yl-propyl)-[1,4]diazepan-1-yl]phenylamine -   2-[4-(4-Aminophenyl)-[1,4]diazepan-1-yl]ethanol -   4-[1,4]Diazepan-1-yl-2-methylphenylamine -   1-[4-(4-Aminophenyl)-[1,4]diazepan-1-yl]ethanone -   4-(4-Aminophenyl)-[1,4]diazepane-1-carboxamidine -   4-(4-Aminophenyl)-N,N-dimethyl-[1,4]diazepane-1-carboxamidine -   1-(4-Aminophenyl)-4-methyl-[1,4]diazepan-6-ol -   3-Methyl-4-(4-methyl-[1,4]diazepan-1-yl)phenylamine -   2-Methyl-4-[4-(3-pyrrolidin-1-yl-propyl)-[1,4]diazepan-1-yl]phenylamine -   2-[4-(4-Amino-3-methylphenyl)-[1,4]diazepan-1-yl]ethanol -   1-[4-(4-Amino-3-methylphenyl)-[1,4]diazepan-1-yl]ethanone -   4-(4-Amino-3-methylphenyl)-[1,4]diazepan-1-carboxamidine -   4-(4-Amino-3-methylphenyl)-N,N-dimethyl-[1,4]diazepane-1-carboxamidine -   1-(4-Amino-3-methylphenyl)-4-methyl-[1,4]diazepan-6-ol.

In the composition of the present invention, the oxidation base(s) of formula (I) are generally present in a quantity of between 0.001 and 10% by weight approximately of the total weight of the dyeing composition, and preferably between 0.005 and 6%.

The compounds of the present invention may be obtained by analogy with methods of preparation described in the literature, see in particular patent application DE 4 241 532 (AGFA).

The composition of the present invention may additionally comprise one or more additional oxidation bases. These additional oxidation bases are chosen from the oxidation bases conventionally used in oxidation dyeing, for example para-phenylenediamines, bisphenylalkylenediamines, para-aminophenols, ortho-aminophenols and heterocyclic bases and their addition salts.

Among the para-phenylenediamines, there may be mentioned more particularly, by way of example, para-phenylenediamine, para-tolylenediamine, 2-chloro-para-phenylenediamine, 2,3-dimethyl-para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,5-dimethyl-para-phenylenediamine, N,N-dimethyl-para-phenylenediamine, N,N-diethyl-para-phenylenediamine, N,N-dipropyl-para-phenylenediamine, 4-amino-N,N-diethyl-3-methylaniline, N,N-bis(β-hydroxyethyl)-para-phenylenediamine, 4-N,N-bis (β-hydroxyethyl)amino-2-methylaniline, 4-N,N-bis(β-hydroxyethyl)amino-2-chloroaniline, 2-β-hydroxyethyl-para-phenylenediamine, 2-fluoro-para-phenylenediamine, 2-isopropyl-para-phenylenediamine, N-(β-hydroxypropyl)-para-phenylenediamine, 2-hydroxymethyl-para-phenylenediamine, N,N-dimethyl-3-methyl-para-phenylenediamine, N,N-(ethyl-β-hydroxyethyl)-para-phenylenediamine, N-(β,γ-dihydro xypropyl)-para-phenylenediamine, N-(4′-aminophenyl)-para-phenylenediamine, N-phenyl-para-phenylenediamine, 2-β-hydroxyethyloxy-para-phenylenediamine, 2-β-acetylaminoethyloxy-para-phenylenediamine, N-(β-methoxyethyl)-para-phenylenediamine, 4-aminophenylpyrrolidine, 2-thienyl-para-phenylenediamine, 2-β-hydroxyethylamino-5-aminotoluene, and their addition salts with an acid.

Among the para-phenylenediamines cited above, there are most particularly preferred para-phenylenediamine, para-tolylenediamine, 2-isopropyl-para-phenylenediamine, 2-β-hydroxyethyl-para-phenylenediamine, 2-β-hydroxyethyloxy-para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,3-dimethyl-para-phenylenediamine, N,N-bis(β-hydroxyethyl)-para-phenylenediamine, 2-chloro-para-phenylenediamine, 2-β-acetylaminoethyloxy-para-phenylenediamine, and their addition salts with an acid.

Among the bisphenylalkylenediamines, there may be mentioned more particularly, by way of example, N,N′-bis(β-hydroxyethyl)-N,N′-bis(4′-aminophenyl)-1,3-diaminopropanol, N,N′-bis(β-hydroxyethyl)-N,N′-bis(4′-aminophenyl)ethylenediamine, N,N′-bis(4-amino-phenyl)tetramethylenediamine, N,N′-bis(β-hydroxyethyl)-N,N′-bis(4-aminophenyl)tetramethylenediamine, N,N′-bis(4-methylaminophenyl)tetramethylenediamine, N,N′-bis(ethyl)-N,N′-bis(4′-amino-3′-methylphenyl)ethylene-diamine, 1,8-bis(2,5-diaminophenoxy)-3,5-dioxaoctane, and their addition salts with an acid.

Among the para-aminophenols, there may be mentioned more particularly, by way of example, para-aminophenol, 4-amino-3-methylphenol, 4-amino-3-fluoro-phenol, 4-amino-3-hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino-2-hydroxymethylphenol, 4-amino-2-methoxymethylphenol, 4-amino-2-aminomethylphenol, 4-amino-2-(β-hydroxyethylaminomethyl)phenol, 4-amino-2-fluorophenol, and their addition salts with an acid.

Among the ortho-aminophenols, there may be mentioned more particularly, by way of example, 2-aminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol, 5-acetamido-2-aminophenol and their addition salts with an acid.

Among the heterocyclic bases, there may be mentioned more particularly, by way of example, the pyridine derivatives, the pyrimidine derivatives and the pyrazole derivatives.

Among the pyridine derivatives, there may be mentioned more particularly the compounds described for example in Patents GB 1,026,978 and GB 1,153,196, such as 2,5-diaminopyridine, 2-(4-methoxyphenyl)amino-3-aminopyridine, 2,3-diamino-6-methoxypyridine, 2-(β-methoxyethyl)amino-3-amino-6-methoxypyridine, 3,4-diaminopyridine, and their addition salts with an acid.

Among the pyrimidine derivatives, there may be mentioned more particularly the compounds described for example in German Patent DE 2,359,399 or in Japanese Patents JP 88-169,571 and JP 05 163 124, in European Patent EP 0 770 375 or Patent Application WO 96/15765, such as 2,4,5,6-tetraaminopyrimidine, 4-hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4-dihydroxy-5,6-diaminopyrimidine, 2,5,6-triaminopyrimidine, and the pyrazolopyrimidine derivatives such as those mentioned in Patent Application FR-A-2,750,048 and among which there may be mentioned pyrazolo[1,5-a]pyrimidine-3,7-diamine; 2,5-dimethylpyrazolo[1,5-a]pyrimidine-3,7-diamine; pyrazolo[1,5-a]pyrimidine-3,5-diamine; 2,7-dimethylpyrazolo[1,5-a]pyrimidine-3,5-diamine; 3-aminopyrazolo[1,5-a]pyrimidin-7-ol; 3-aminopyrazolo[1,5-a]pyrimidin-5-ol; 2-(3-amino-pyrazolo[1,5-a]pyrimidin-7-ylamino)ethanol, 2-(7-aminopyrazolo[1,5-a]pyrimidin-3-ylamino)ethanol, 2-[(3-aminopyrazolo[1,5-a]pyrimidin-7-yl)-(2-hydroxyethyl)-amino]ethanol, 2-[(7-aminopyrazolo[1,5-a]pyrimidin-3-yl)-(2-hydroxyethyl)amino]ethanol, 5,6-dimethyl-pyrazolo[1,5-a]pyrimidine-3,7-diamine, 2,6-dimethyl-pyrazolo[1,5-a]pyrimidine-3,7-diamine, 2,5,N7,N7-tetramethylpyrazolo[1,5-a]pyrimidine-3,7-diamine, 3-amino-5-methyl-7-imidazolylpropylaminopyrazolo-[1,5-a]pyrimidine, their tautomeric forms, when a tautomeric equilibrium exists, and their addition salts with an acid.

Among the pyrazole derivatives, there may be mentioned more particularly the compounds described in Patents DE 3,843,892, DE 4,133,957 and Patent Applications WO 94/08969, WO 94/08970, FR-A-2,733,749 and DE-195 43 988 such as 4,5-diamino-1-methylpyrazole, 4,5-diamino-l-(β-hydroxyethyl)pyrazole, 3,4-diaminopyrazole, 4,5-diamino-1-(4′-chlorobenzyl)-pyrazole, 4,5-diamino-1,3-dimethylpyrazole, 4,5-diamino-3-methyl-1-phenylpyrazole, 4,5-diamino-1-methyl-3-phenylpyrazole, 4-amino-1,3-dimethyl-5-hydrazinopyrazole, 1-benzyl-4,5-diamino-3-methyl-pyrazole, 4,5-diamino-3-tert-butyl-1-methylpyrazole, 4,5-diamino-1-tert-butyl-3-methylpyrazole, 4,5-diamino-1-(β-hydroxyethyl)-3-methylpyrazole, 4,5-diamino-1-ethyl-3-methylpyrazole, 4,5-diamino-l-ethyl-3-(4′-methoxyphenyl)pyrazole, 4,5-diamino-1-ethyl-3-hydroxy-methylpyrazole, 4,5-diamino-3-hydroxymethyl-1-methyl-pyrazole, 4,5-diamino-3-hydroxymethyl-1-isopropyl-pyrazole, 4,5-diamino-3-methyl-1-isopropylpyrazole, 4-amino-5-(2′-aminoethyl)amino-1,3-dimethylpyrazole, 3,4,5-triaminopyrazole, 1-methyl-3,4,5-triamino-pyrazole, 3,5-diamino-1-methyl-4-methylaminopyrazole, 3,5-diamino-4- (β-hydroxyethyl)amino-1-methylpyrazole, and their addition salts with an acid.

The additional oxidation bases are generally present in a quantity of between 0.001 to 10% by weight approximately of the total weight of the dyeing composition, and preferably from 0.005 to 6%.

The composition according to the invention may contain one or more conventional couplers used for dyeing keratinous fibres. Among these couplers, there may be mentioned in particular meta-phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene couplers and heterocyclic couplers and their addition salts.

By way of example, there may be mentioned 2-methyl-5-aminophenol, 5-N-(β-hydroxyethyl)amino-2-methylphenol, 6-chloro-2-methyl-5-aminophenol, 3-aminophenol, 1,3-dihydroxybenzene, 1,3-dihydroxy-2-methylbenzene, 4-chloro-1,3-dihydroxybenzene, 2,4-diamino-1-(β-hydroxyethyloxy)benzene, 2-amino-4-(β-hydroxyethylamino)-1-methoxybenzene, 1,3-diaminobenzene, 1,3-bis(2,4-diaminophenoxy)propane, 3-ureidoaniline, 3-ureido-1-dimethylaminobenzene, sesamol, 1-β-hydroxyethylamino-3,4-methylenedioxybenzene, α-naphthol, 2-methyl-1-naphthol, 6-hydroxyindole, 4-hydroxyindole, 4-hydroxy-N-methylindole, 2-amino-3-hydoxypyridine, 6-hydroxy-benzomorpholine, 3,5-diamino-2,6-dimethoxypyridine, 1N-(β-hydroxyethyl)amino-3,4-methylenedioxybenzene, 2,6-bis(β-hydroxyethylamino)toluene, and their addition salts with an acid.

In the composition of the present invention, the coupler(s) are generally present in a quantity of between 0.001 and 10% by weight approximately of the total weight of the dyeing composition, and preferably from 0.005 to 6%.

In general, the addition salts with an acid which can be used in the context of the dyeing compositions of the invention for the oxidation bases of formula (I), the additional oxidation bases and the couplers are chosen in particular from hydrochlorides, hydrobromides, sulphates, citrates, succinates, tartrates, lactates, tosylates, benzenesulphonates, phosphates and acetates.

The addition salts with a base which can be used in the context of the invention are chosen for example from the addition salts with sodium hydroxide, potassium hydroxide, ammonium hydroxide, amines and alkanolamines.

The dyeing composition in accordance with the invention may additionally contain one or more direct dyes which may be chosen in particular from nitro dyes of the benzene series, cationic direct dyes, azo direct dyes, methene direct dyes.

The medium appropriate for dyeing also called dye carrier generally consists of water or of a mixture of water and of at least one organic solvent to solubilize the compounds which might not be sufficiently soluble in water. As organic solvent, there may be mentioned for example lower C₁-C₄ alkanols, such as ethanol and isopropanol; polyols or polyol ethers such as 2-butoxyethanol, propylene glycol, monomethyl ether of propylene glycol, monoethyl ether and monomethyl ether of diethylene glycol, as well as aromatic alcohols such as benzyl alcohol or phenoxyethanol, and mixtures thereof.

The solvents may be present in proportions preferably of between 1 and 40% by weight approximately relative to the total weight of the dyeing composition, and still more preferably between 5 and 30% by weight approximately.

The dyeing composition in accordance with the invention may also contain various adjuvants which are conventionally used in hair-dyeing compositions, such as anionic, cationic, nonionic, amphoteric or zwitterionic surfactants or mixtures thereof, anionic, cationic, nonionic, amphoteric or zwitterionic polymers or mixtures thereof, inorganic or organic thickening agents, and in particular anionic, cationic, nonionic and amphoteric polymeric associative thickeners, antioxidants, penetrating agents, sequestering agents, perfumes, buffers, dispersing agents, conditioning agents such as for example modified or unmodified, volatile or nonvolatile silicones, film-forming agents, ceramides, preservatives and opacifying agents.

These above adjuvants are generally present in a quantity for each of them of between 0.01 and 20% by weight relative to the weight of the composition.

Of course, persons skilled in the art will be careful to choose this or these possible additional compounds such that the advantageous properties intrinsically attached to the oxidation dyeing composition in accordance with the invention are not, or not substantially, impaired by the addition(s) envisaged.

The pH of the dyeing composition in accordance with the invention is generally between 3 and 12 approximately, and preferably between 5 and 11 approximately. It can be adjusted to the desired value by means of acidifying or alkalinizing agents normally used in dyeing keratinous fibres or using conventional buffer systems.

Among the acidifying agents, there may be mentioned, by way of example, inorganic or organic acids such as hydrochloric acid, orthophosphoric acid, sulphuric acid, carboxylic acids such as acetic acid, tartaric acid, citric acid, lactic acid and sulphonic acids.

Among the alkalinizing agents, there may be mentioned, by way of example, aqueous ammonia, alkali metal carbonates, alkanolamines such as mono-, di- and triethanolamines as well as derivatives thereof, sodium or potassium hydroxides and the compounds of the following formula (III):

in which W is a propylene residue optionally substituted by a hydroxyl group or a C₁-C₄ alkyl radical; R₆, R₇, R₈ and R₉, which are identical or different, represent a hydrogen atom, a C₁-C₄ alkyl or C₁-C₄ hydroxyalkyl radical.

The dyeing composition according to the invention may be provided in various forms, such as in the form of liquids, creams, gels or in any other form appropriate for carrying out a dyeing of keratinous fibres, and in particular human hair.

The subject of the invention is also a method of dyeing keratinous fibres, and in particular human keratinous fibres such as hair, using the dyeing composition as defined above.

According to this method, the composition according to the present invention is applied to the fibres, the colour being developed with the aid of an oxidizing agent. The colour may be developed at an acidic, neutral or alkaline pH and the oxidizing agent may be added to the composition of the invention just at the time of use or it may be used from an oxidizing composition containing it, applied simultaneously or sequentially to the composition of the invention.

According to a particular embodiment, the composition according to the present invention is mixed, preferably at the time of use, with a composition containing, in a medium appropriate for dyeing, at least one oxidizing agent, this oxidizing agent being present in a sufficient quantity to develop a colour. The mixture obtained is then applied to the keratinous fibres. After an exposure time of 3 to 50 minutes approximately, preferably 5 to 30 minutes approximately, the keratinous fibres are rinsed, washed with shampoo, rinsed again and then dried.

The oxidizing agents conventionally used for the oxidation dyeing of keratinous fibres are for example hydrogen peroxide, urea peroxide, alkali metal bromates, persalts such as perborates and persulphates, peracids and oxidase enzymes among which there may be mentioned peroxidases, oxidoreductases containing two electrons such as uricases and oxygenases containing 4 electrons such as laccases. Hydrogen peroxide is particularly preferred.

The oxidizing composition may also contain various adjuvants conventionally used in hair dyeing compositions and as defined above for the composition of the invention.

The pH of the oxidizing composition containing the oxidizing agent is such that after mixing with the dyeing composition, the pH of the resulting composition applied to the keratinous fibres varies between 3 and 12 approximately, and preferably between 5 and 11. It can be adjusted to the desired value by means of acidifying or alkalinizing agents normally used for dyeing keratinous fibres and as defined above.

The composition which is finally applied to the keratinous fibres may be provided in various forms, such as in the form of liquids, creams, gels, or in any other form appropriate for dyeing keratinous fibres, and in particular human hair.

Another subject of the invention is a multicompartment device or dyeing “kit” in which a first compartment contains the dyeing composition defined above and a second compartment contains the oxidizing composition. This device may be equipped with a means which makes it possible to deliver the desired mixture onto the hair, such as the devices described in patent FR-2 586 913 in the name of the applicant.

Finally, the subject of the invention is also the coloured product which can be obtained by oxidative condensation of the composition of the present invention. This composition comprises at least one oxidation base of formula (I) as defined above in the presence of at least one oxidizing agent as defined above and optionally in the presence of at least one coupler and/or at least one additional oxidation base.

These coloured products may be provided in particular in the form of pigments and may be used as direct dyes for the direct dyeing of hair or may be incorporated into cosmetic products such as for example into makeup products.

The subject of the present invention is finally the novel para-phenylenediamine derivatives of formula (I) with the exception of 4-(4-methyl-[1,4]diazepan-1-yl)phenylamine.

The examples which follow serve to illustrate the invention without however exhibiting a limiting character.

EXAMPLES Example 1

Synthesis of 4-(4-Methyl-[1,4]Diazepan-1-Yl)Phenylamine Dihydrochloride (2)

Step 1: Synthesis of 1-Methyl-4-(4-Nitrophenyl)-[1,4]Diazepane (1):

Fluoronitrobenzene (10.3 g, 0.073 mol) is dissolved in water and then potassium carbonate (12.1 g, 0.0876 mol) is added. 1-Methyl[1,4]diazepane (10 g, 0.0876 mol) is introduced and then the reaction medium is heated under reflux (≅100° C.) for 5 hours. The medium is cooled. A precipitate forms, which is filtered and washed with water. A yellow solid is recovered, which is dried at 45° C. in a vacuum oven (16.21 g, yield=94.5%).

Spectroscopic Data:

-   1 H NMR (DMSO d6, 200 MHz): 1.63-1.75 (m, 2 H), 2.06 (s, 3 H),     2.22-2.33 (m, 2 H), 2.40-2.45 (m, 2 H), 3.34-3.51 (m, 4 H),     6.58-6.66 (m, 2 H), 7.79-7.88 (m, 2 H)     Step 2: Synthesis of 4-(4-Methyl-[1,4]Diazepan-1-Yl)Phenylamine,     Dihydrochloride (2):

In a stainless steel hydrogenating reactor, 6 g of 1-methyl-4-(4-nitrophenyl)-[1,4]diazepane (1) (25.5 mmol) are partially dissolved in 300 ml of ethanol. 2.1 g of 5% Pd/C (50% moist) are added, the reactor is closed and purged with nitrogen 3 times, with stirring (1 800 rpm). Hydrogen is then introduced at a pressure of 12 bar at room temperature for 4 hours. The reactor is then purged with nitrogen and the reaction medium is filtered under a nitrogen atmosphere and the filtrate is immediately recovered in a solution containing 9.6 ml of 37% hydrochloric acid and 50 ml of isopropanol. The filtrate is then concentrated until a precipitate is obtained. The solid is filtered, washed with isopropanol and then dried under vacuum in the presence of potassium hydroxide. 4.5 g (63%) of 4-(4-methyl-[1,4]diazepan-1-yl)phenylamine, dihydrochloride (2) are thus obtained in the form of a white solid.

Spectroscopic Data:

-   1 H NMR (D20 d6, 400 MHz): 2.16 (m, 1 H), 2.35 (m, 1 H), 2.77 (s, 3     H), 3.08-3.15 (m, 2 H), 3.38-3.46 (m, 4 H), 3.73-3.80 (m, 2 H), 6.82     (d, J=9.2 Hz, 2 H), 7.21 (d, J=9.2 Hz, 2 H) -   ³C NMR (MeOD, 100 MHz): 23.3, 43.05, 43.44, 46.85, 54.90, 55.88 -   Mass spectrum: spectrum in conformity with the structure.

Example 2

Synthesis of 4-[1,4]Diazepan-1-Yl-2-Methylphenylamine, Dihydrochloride (3)

Step 1: Synthesis of 1- (3-Methyl-4-Nitrophenyl)-[1,4]Diazepane (1):

Fluoronitrobenzene (9.1 g, 0.0586 mol) is dissolved in water (50 ml) and then potassium carbonate (9.7 9, 0.0703 mol) and 1-acetyl-[1,4]diazepane (10 g, 0.0703 mol) are added. The medium is heated at 95° C. for 6 hours, and an orange-coloured solution is obtained. The medium is then cooled to room temperature, and an orange-coloured sticky paste then appears. The maximum amount of water is removed from the reaction medium. Isopropanol is then added to the paste until a yellow solid precipitates. The medium is filtered and, after drying in a vacuum oven at 45° C., a yellow powder is obtained which corresponds to 1-(3-methyl-4-nitrophenyl)-[1,4]diazapane (1). (8.7 g; Yield=53.6%)

Spectroscopic Data:

-   ¹ H NMR (DMSO d6, 200 MHz): 1.57-1.81 (m, 5 H), 2.39 (s, 3 H),     3.13-3.25 (m, 4 H), 3.38-3.52 (m, 5 H), 3.60-3.65 (m, 1 H),     6.56-6.63 (m, 2 H), 7.79-7.85 (m, 1 H)     Step 2: Synthesis of 1-(3-Methyl-4-Nitrophenyl)-[1,4]Diazepane (2):

1-(3-Methyl-4-nitrophenyl)-[1,4]diazepane 1 (8 g, 0.0289 mol) is suspended in a 37% HCl solution (29 ml) in water (145 ml). The medium is heated under reflux (100° C.) for 30 hours. It is allowed to cool, and a brown precipitate is then obtained. About 30 ml of 35% sodium hydroxide are added to pH=7. The reaction medium is then concentrated until a solid appears. After filtration, this solid is recrystallized from an isopropanol/methanol mixture. A brown powder is thus obtained which corresponds to 1-(3-methyl-4-nitrophenyl)-[1,4]diazepane (2). (2.4 g, Yield.=33%)

Spectroscopic Data:

-   ¹H NMR (DMSO d6, 200 MHz): 2.18 (m, 2 H), 2.65 (s, 3 H), 3.12-3.14     (m, 2 H), 3.25 (m, 2 H), 3.70-3.76 (m, 2 H), 3.92 (m, 2 H), 6.84 (m,     2 H), 8.02-8.12 (m, 1 H), 9.03-9.33 (m, 1 H)     Step 3: Synthesis of 4-[1,4]Diazepan-1-Yl-2-Methylphenylamine,     Dihydrochloride (3):

In a stainless steel hydrogenating reactor, 2.34 g of 1-(3-methyl-4-nitrophenyl)-[1,4]diazepane 2 (9.96 mmol) are dissolved in 150 ml of ethanol. 1.2 g of 5% Pd/C (50% moist) are added, the reactor is closed and purged with nitrogen 3 times, with stirring (1 800 rpm). Hydrogen is then introduced at a pressure of 9 bar at room temperature for 3 hours. The reactor is then purged with nitrogen and the reaction medium is filtered under a nitrogen atmosphere and the filtrate is immediately recovered in a solution containing 3.7 ml of 37% hydrochloric acid and 16 ml of isopropanol. The filtrate is then concentrated until a precipitate is obtained. The solid is filtered, washed with isopropanol and then dried under vacuum in the presence of potassium hydroxide. 2 g (72%) of 4-[1,4]diazepan-1-yl)-2-methylphenylamine, dihydrochloride (3) are thus obtained in the form of a white solid.

Spectroscopic Data:

-   ¹H NMR (D20 d6, 400 MHz): 1.92-1.99 (m, 2 H), 2.09 (m, 3 H),     3.03-3.09 (m, 2 H), 3.18-3.23 (m, 2 H), 3.36-3.40 (m, 2 H),     3.56-3.61 (m, 2 H), 6.59-6.60 (m, 2 H), 7.00. (d, J=8.7 Hz, 1 H) -   Mass spectrum: spectrum in conformity

Example 3

Synthesis of 4-[4-(3-Pyrrolidin-1-Yl-Propyl)-[1,4]Diazepan-1-Yl)Phenylamine, Trihydrochloride (2)

Step 1: Synthesis of 1-(4-Nitrophenyl)-4-(3-Pyrrolidin-1-Yl-Propyl)-[1,4]Diazepane (1):

Fluoronitrobenzene (5.56 g, 39.43 mmol) is dissolved in water, and then potassium carbonate (6.55 g, 47.31 mmol) and 1-(3-pyrrolidinopropyl)-homopiperazine (10 g, 47.31 mmol) are added. The medium is heated at 85° for 4 hours and then cooled to room temperature. The medium is filtered and a yellow solid is recovered after drying in a vacuum oven at 45° C. (12.5 g, yield=95.5%).

Spectroscopic Data

-   ¹H NMR (DMSO d6, 200 MHz): 1.55-1.71 (m, 6 H), 1.90-1.96 (m, 2 H),     2.32-2.61 (m, 10 H), 2.75-2.80 (m, 2 H), 3.63-3.73 (m, 4 H), 6.89     (d, J=9.4 Hz, 2 H), 8.09 (d, J=9.4 Hz, 2 H)     Step 2: Synthesis of     4-[4-(3-Pyrrolidin-1-Yl-Propyl)-[1,4]Diazepan-1-Yl]Phenylamine,Tihydrochloride     (2):

In a stainless steel hydrogenating reactor, 6.6 g of 1-(4-nitrophenyl)-4-(3-pyrrolidin-1-yl-propyl)-[1,4]diazepane (1) (19.9 mmol) are partially dissolved in 300 ml of ethanol. 2.3 g of 5% Pd/C (50% moist) are added, the reactor is closed and purged with nitrogen 3 times, with stirring (1 800 rpm). Hydrogen is then introduced at a pressure of 10 bar at room temperature for 3 hours. The reactor is then purged with nitrogen and the reaction medium is filtered under a nitrogen atmosphere and the filtrate is immediately recovered in a solution containing 9.1 ml of 37% hydrochloric acid and 40 ml of isopropanol. The filtrate is then concentrated until a precipitate is obtained. The solid is filtered, washed with isopropanol and then dried under vacuum in the presence of potassium hydroxide. 5.9 g (72%) of 4-[4-(3-pyrrolidin-1-yl-propyl)-[1,4]diazepan-1-yl)phenylamine, trihydrochloride (2) are thus obtained in the form of a white solid.

Spectroscopic Data:

-   ¹H NMR (D20 d6, 500 MHz): 2.02-2.04 (m, 2 H), 2.18 (m, 2 H),     2.18-2.31 (m, 4 H), 3.12-3.14 (m, 2 H), 3.30-3.35 (m, 4 H),     3.57-3.59 (m, 2 H), 3.71-3.72 (m, 2 H), 3.87 (m, 2 H), 6.94 (d,     J=8.9 Hz, 2 H), 7.32 (d, J=8.9 Hz, 2 H) -   Mass spectrum: spectrum in conformity with the structure.

Example 4

Synthesis of 4-[1,4]Diazepan-1-Yl-Phenylamine, Dichlorohydrate (2)

Step 1: Synthesis of 1-Benzyl-4-(4-Nitrophenyl)-[1,4]Diazepane (1):

Fluoronitrobenzene (3.09 g, 21.9 mmol) is dissolved in water (14 ml), and then potassium carbonate (3.64 g, 26.28 mmol) and 1-benzylhomopiperazine (5 g, 26.28 mmol) are added. The medium is heated at 90° C. for 4 h 20 min and then cooled to room temperature. The precipitate formed is filtered, and a yellow solid is obtained. 6.30 g (92.5%) of product are recovered.

Spectroscopic Data

-   ¹H NMR (DMSO d6, 500 MHz): 2.08-2.16 (m, 2 H), 2.74-2.80 (m, 2 H),     2.92-2.97 (m, 2 H), 3.85-3.92 (m, 6 H), 7.07 (d, J=9.5 Hz, 2 H),     7.44-7.59 (m, 5 H), 8.27 (d, J=9.5 Hz, 2 H)     Step 2: Synthesis of 4-[1,4]Diazepan-1-Yl-Phenylamine,     Dihydrochloride (2):

In a stainless steel hydrogenating reactor, 6.3 g of 1-benzyl-4-(4-nitrophenyl)-(1,4]diazepane 1 (22.26 mmol) are partially dissolved in 170 ml of ethanol. 2.3 g of 5% Pd/C (50% moist) are added, the reactor is closed and purged with nitrogen 3 times, with stirring (1 800 rpm). Hydrogen is then introduced at a pressure of 11 bar, the medium is heated to a temperature of 60° C. and then allowed to cool for 3.5 hours. The reactor is then purged with nitrogen and the reaction medium is filtered under a nitrogen atmosphere and the filtrate is immediately recovered in a solution containing 7.6ml of 37% hydrochloric acid and 30 ml of isopropanol. The filtrate is then concentrated until a precipitate is obtained. The solid is filtered, washed with isopropanol and then dried under vacuum in the presence of potassium hydroxide. 4.6 g of 4-[1,4]diazepan-1-yl-phenylamine, dihydrochloride (2) are thus obtained in the form of a white solid.

Spectroscopic Data:

-   ¹ H NMR (D20, 500 MHz): 2.23-2.28 (m, 2 H), 3.36-3.39 (m, 2 H),     3.52-3.54 (m, 2 H), 3.65-3.69 (m, 2 H), 3.89-3.91 (m, 2 H), 7.07 (m,     2 H), 7.37 (m, 2 H) -   Mass spectrum: spectrum in conformity with the structure.

Example 5

Synthesis of 2-[4-(4-Aminophenyl)-[1,4]Diazepan-1-Yl]Ethanol, Dihydrochloride (2)

Step 1: Synthesis of 2-[4-(4-Nitrophenyl)-[1,4]Diazepan-1-Yl]Ethanol (1):

Fluoronitrobenzene (2.03 g, 14.4 mmol) is dissolved in water (10 ml), and then potassium carbonate (2.4 g, 17.3 mmol) and 1-(2-hydroxyethyl)-homopiperazine are added. The medium is heated at 95° C. for 4 hours and then cooled to room temperature and filtered. A dark orange-coloured powder is recovered which is placed in the oven (3.5 g, yield=91.7%).

Spectroscopic Data ¹H NMR (DMSO d6, 200 MHz): 1.66-1.78 (m, 2 H), 2.37-2.48 (m, 6 H), 2.63-2.68 (m, 2 H), 3.29-3.35 (m, 2 H), 3.44-3.69 (m, 4 H), 4.26 (m, 1 H), 6.66-6.74 (m, 2 H), 7.86-7.95 (m, 2 H)

Step 2: Synthesis of 2-[4-(4-Aminophenyl)-[1,4]Diazepan-1-Yl]Ethanol, Dihydrochloride (2):

In a stainless steel hydrogenating reactor, 6.9 g of 2-[4-(4-nitrophenyl)-[1,4]diazepan-1-yl]ethanol (26.04 mmol) are partially dissolved in 350 ml of ethanol. 2.5 g of 5% Pd/C (50% moist) are added, the reactor is closed and purged with nitrogen 3 times, with stirring (1 800 rpm). Hydrogen is then introduced at a pressure of 9 bar for 4.5 hours. The reactor is then purged with nitrogen and the reaction medium is filtered under a nitrogen atmosphere and the filtrate is immediately recovered in a solution containing 9.8 ml of 37% hydrochloric acid and 40 ml of isopropanol. The filtrate is then concentrated until a precipitate is obtained. The solid is filtered, washed with isopropanol and then dried under vacuum in the presence of potassium hydroxide. 7.8 g of 2-[4-(4-aminophenyl)-[1,4]diazepan-1-yl]ethanol, dihydrochloride (2) are thus obtained in the form of a white solid.

Spectroscopic Data:

-   ¹ H NMR (D20 d6, 500 MHz): 2.17-2.18 (m, 1 H), 2.49-2.50 (m, 1 H),     3.10-3.21 (m, 4 H), 3.41-3.55 (m, 4 H), 3.78-3.81 (m, 4 H), 6.83 (m,     2 H), 7.22 (m, 2 H) -   Mass spectrum: spectrum in conformity with the structure.

Elemental analysis % C % H % N % O % Cl Theory 50.66 7.52 13.63 5.19 23 Found 50.17 7.53 13.59 5.49 22.99

Examples of Compositions

The following compositions were prepared (content of the bases and couplers in mol) Examples 6 7 8 9 10 11 12 4-[1,4]Diazepan-1-yl-2- 3 × 10⁻³ 3 × 10⁻³ 3 × 10⁻³ 3 × 10⁻³ — — — methylphenylamine, trihydrochloride 4-[4-(3-Pyrrolidin-1-yl- — — — — 3 × 10⁻³ 3 × 10⁻³ 3 × 10⁻³ propyl)-[1,4]diazepan- 1-yl]phenylamine, trihydrochloride 1,3-Dihydroxybenzene — 3 × 10⁻³ — — 3 × 10⁻³ — — 1-β-Hydroxyethyloxy-2,4- — — 3 × 10⁻³ — — 3 × 10⁻³ — diaminobenzene, 2HCl 2-Methyl-5-aminophenol — — — 3 × 10⁻³ — — 3 × 10⁻³ Dye carrier (*) (*) (*) (*) (*) (*) (*) Demineralized water qs 100 g 100 g 100 g 100 g 100 g 100 g 100 g Examples 13 14 15 16 17 18 19 20 4-[1,4]Diazepan-1-yl- 3 × 10⁻³ 3 × 10⁻³ 3 × 10⁻³ 3 × 10⁻³ — — — — phenylamine, dihydrochloride 2-[4-(4-Aminophenyl)- — — — — 3 × 10⁻³ 3 × 10⁻³ 3 × 10⁻³ 3 × 10⁻³ [1,4]diazepan- 1-yl]ethanol, trihydrochloride 1,3-Dihydroxybenzene — 3 × 10⁻³ — — — 3 × 10⁻³ — — 1-β-Hydroxyethyloxy- — — 3 × 10⁻³ — — — 3 × 10⁻³ — 2,4-diaminobenzene, 2HCl 2-Methyl-5-aminophenol — — — 3 × 10⁻³ — — — 3 × 10⁻³ Dye carrier (*) (*) (*) (*) (*) (*) (*) (*) Demineralized water qs 100 g 100 g 100 g 100 g 100 g 100 g 100 g 100 g (*) Common dye carrier: Polyglycerolated oleyl alcohol  4.0 g containing 2 mol of glycerol Polyglycerolated oleyl alcohol  5.69 g A.S. containing 4 mol of glycerol, containing 78% of active substances (A.S.) Oleic acid  3.0 g Oleyl amine containing 2 mol of ethylene  7.0 g oxide, sold under the trade name ETHOMEEN O12 by the company AKZO Diethylaminopropyl laurylamino  3.0 g A.S. succinamate, sodium salt containing 55% of A.S. Oleyl alcohol  5.0 g Oleic acid diethanolamide  12.0 g Propylene glycol  3.5 g Ethyl alcohol  7.0 g Dipropylene glycol  0.5 g Propylene glycol monomethyl ether  9.0 g Sodium metabisulfite as an aqueous 0.455 g A.S. solution containing 35% of A.S. Ammonium acetate  0.8 g Antioxidant, sequestrant q.s. Perfume, preservative q.s. Aqueous ammonia containing 20% of NH₃  10.0 g

At the time of use, each composition is mixed with an equal weight of hydrogen peroxide at 20 volumes (6% by weight).

Each mixture obtained is applied to locks of natural or permanently waved grey hair which is 90% white. After leaving for 30 min, the locks are rinsed, washed with a standard shampoo, rinsed again and then dried.

The colour of the locks was evaluated in the L*a*b* system by means of a MINOLTA CM 2002 spectrophotometer.

In the L*a*b* space, the clarity is indicated by the value L* on a scale from 0 to 100 whereas the chromatic coordinates are expressed by a* and b* which indicate two colour axes, a*. the green-red axis and b* the blue-yellow axis.

According to this system, the higher the value of L, the lighter and less intense the colour. Conversely, the lower the value of L, the darker or more intense the colour.

The results are presented in Table 1 below. TABLE 1 Nature of Examples the locks L* a* b* Ref. 1 natural 61.06 0.72 11.74 Ref. 2 permanently 59.7 0.24 9.10 waved  6 natural 50.38 3.45 7.46  7 natural 38.86 5.30 5.97  8 natural 28.26 −0.41 −12.60  9 natural 32.71 10.85 −7.57 10 natural 32.01 5.87 3.38 11 natural 27.47 −0.98 −11.14 12 natural 33.39 8.39 −7.77 13 natural 55.66 4.21 10.12 14 natural 49.12 3.93 9.59 15 natural 39.85 −5.27 −0.29 16 natural 45.92 −0.57 −3.41 17 natural 39.97 1.53 5.77 permanently 33.47 2.56 5.98 waved 18 natural 30.79 5.35 4.86 permanently 25.74 4.60 3.94 waved 19 natural 22.04 2.19 −10.60 permanently 20.04 1.67 −5.66 waved 20 natural 25.15 9.51 −5.83 permanently 20.50 6.67 −4.54 waved 

1-22 (canceled)
 23. A composition for the oxidation dyeing of keratin fibers comprising, in a medium suitable for dyeing, at least one oxidation base chosen from compounds of the following formula (I) and the addition salts thereof:

wherein: R₁ is chosen from: a halogen atom; and linear and branched C₁-C₆ hydrocarbon chains, wherein the hydrocarbon chains may be saturated or may comprise at least one bond chosen from double bonds and triple bonds, the hydrocarbon chains may form at least one ring chosen from 3- to 6-membered rings, wherein at least one carbon atom can be replaced by at least one entity chosen from oxygen, nitrogen and sulphur atoms, and an SO₂ group, or, when the carbon is terminal, it may be replaced by a halogen atom; provided that the radical R₁ does not comprise a peroxide bond, a diazo radical, a nitro radical, or a nitroso radical; n is a number ranging from 0 to 4 inclusive, it being understood that when n is greater than or equal to 2, then the radicals R₁ may be identical or different; R₂ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated, unsubstituted and substituted with at least one radical chosen from carboxyl radicals, alkylcarbonyl radicals, alkoxycarbonyl radicals, carbamoyl radicals, mono- and dialkylcarbamoyl radicals, saturated and unsaturated, nitrogen- oxygen- and sulphur-comprising heterocyclic radicals comprising 4, 5, 6 or 7, identical or different, atoms; alkyl radicals which may be unsaturated, substituted at least at the 2-position by at least one radical chosen from hydroxyl radicals, alkoxy radicals, amino radicals, mono- and dialkylamino radicals, thiol radicals and halogen atoms; an alkylcarbonyl radical; an alkoxycarbonyl radical; a monoalkylcarbamoyl and dialkylcarbamoyl radical; a carbamoyl radical; and a radical R₆R₇N—C═NR₅— wherein R₅, R₆, and R₇, which may be identical or different, are each chosen from hydrogen, C₁-C₄ alkyl radicals and hydroxyalkyl radicals; R₃ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated; a hydroxyl radical; a hydroxyalkyl radical; an alkoxy radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an amino radical; a monoalkylamino and a dialkylamino radical; an aminoalkyl radical, it being possible for the amine to be mono- or disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; R₄ is chosen from: alkyl radicals which may be unsaturated; a hydroxyalkyl radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an aminoalkyl radical, wherein the amine may be mono- or disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; and m is a number ranging from 0 to 4 inclusive, it being understood that when m is greater than or equal to 2, then the radicals R₄ may be identical or different.
 24. The composition according to claim 23, wherein, in R₁, the halogen atom is chosen from chlorine and bromine.
 25. The composition according to claim 23, wherein R₂ is radical R₆R₇N—C═NR₅—, wherein R₅ is a hydrogen atom and R₆ and R₇, which may be identical or different, are each chosen from a hydrogen atom and a methyl radical.
 26. The composition according to claim 23, wherein R₁ is chosen from alkyl, hydroxyalkyl, aminoalkyl, alkoxy, and hydroxyalkoxy radicals.
 27. The composition according to claim 23, wherein R₁ is chosen from methyl, hydroxymethyl, 2-hydroxyethyl, 1,2-dihydroxyethyl, methoxy, and 2-hydroxyethoxy radicals.
 28. The composition according to claim 23, wherein n is equal to 0 or
 1. 29. The composition according to claim 23, wherein R₂ is chosen from hydrogen, alkyl radicals, alkyl radicals substituted with at least one entity chosen from saturated and unsaturated, nitrogen-, sulfur-, and oxygen-comprising heterocyclic radicals comprising 4, 5 or 6, identical or different atoms, an alkoxycarbonyl radical, and alkyl radicals substituted at least at the 2-position with at least one hydroxyl radical.
 30. The composition according to claim 23, wherein R₂ is chosen from a 2-hydroxyethyl radical, a 3-(1-pyrrolidinyl)propyl radical, a methyl radical, an acetyl radical, and hydrogen.
 31. The composition according to claim 23, wherein R₃ is chosen from hydrogen, alkyl radicals, alkyl radicals substituted with at least one hydroxyl radical, alkyl radicals substituted with at least one amino radical, and carboxyl radicals.
 32. The composition according to claim 23, wherein R₃ is chosen from a hydrogen atom, hydroxyl radicals, carboxyl radicals, amino radicals, hydroxymethyl radicals, and aminomethyl radicals.
 33. The composition according to claim 23, wherein R₄ is chosen from hydrogen, alkyl radicals, alkyl radicals substituted with at least one hydroxyl radical, alkyl radicals substituted with at least one amino radical, and carboxyl radicals.
 34. The composition according to claim 23, wherein R₄ is a hydrogen atom.
 35. The composition according to claim 23, wherein the at least one oxidation base of formula (I) is chosen from: 4-(4-Methyl-[1,4]diazepan-1-yl)phenylamine; 4-[1,4]Diazepan-1-yl-phenylamine; 4-[4-(3-Pyrrolidin-1-yl-propyl)-[1,4]diazepan-1-yl]phenylamine; 2-[4-(4-Aminophenyl)-[1,4]diazepan-1-yl]ethanol; 1-[4-(4-Aminophenyl)-[1,4]diazepan-1-yl]ethanone; 4-(4-Aminophenyl)-[1,4]diazepane-1-carboxamidine; 4-(4-Aminophenyl)-N,N-dimethyl-[1,4]diazepane-1-carboxamidine; 1-(4-Aminophenyl)-4-methyl-[1,4]diazepan-6-ol; 1-(4-Aminophenyl)-4-methyl-[1,4]diazepan-6-ylamine; 1-(4-Aminophenyl)-4-(3-pyrrolidin-1-yl-propyl)-[1,4]diazepan-6-ol; 1-(4-Aminophenyl)-4-(3-pyrrolidin-1-yl-propyl)-[1,4]diazepan-6-ylamine; 1-(4-Aminophenyl)-4-(2-hydroxyethyl)-[1,4]diazepan-6-ol; 2-[6-Amino-4-(4-aminophenyl)-[1,4]diazepan-1-yl]ethanol; 2-[4-(4-Aminophenyl)-6-hydroxymethyl-[1,4]diazepan-1-yl]ethanol; 2-Methyl-4-(4-methyl-[1,4]diazepan-1-yl)phenylamine; 4-[1,4]Diazepan-1-yl-2-methylphenylamine; 2-Methyl-4-[4-(3-pyrrolidin-1-yl-propyl)-[1,4]diazepan-1-yl]phenylamine; 2-[4-(4-Amino-3-methylphenyl)-[1,4]diazepan-1-yl]ethanol; 1-[4-(4-Amino-3-methylphenyl)-[1,4]diazepan-1-yl]ethanone; 4-(4-Amino-3-methylphenyl)-[1,4]diazepane-1-carboxamidine; 4-(4-Amino-3-methylphenyl)-N,N-dimethyl-[1,4]diazepane-1-carboxamidine; 1-(4-Amino-3-methylphenyl)-4-methyl-[1,4]diazepan-6-ol; 1-(4-Amino-3-methylphenyl)-4-methyl-[1,4]diazepan-6-ylamine; 1-(4-Amino-3-methylphenyl)-4-(3-pyrrolidin-1-yl-propyly[1,4]diazepan-6-ol; 1-(4-Amino-3-methylphenyl)-4-(3-pyrrolidin-1-yl-propyly[1,4]diazepan-6-ylamine; 1-(4-Amino-3-methylphenyl)-4-(2-hydroxyethyl)-[1,4]diazepan-6-ol; 2-[6-Amino-4-(4-amino-3-methylphenyl)-[1,4]diazepan-1-yl]ethanol; and 2-[4-(4-Amino-3-methylphenyl)-6-hydroxymethyl-[1,4]diazepan-1-yl]ethanol.
 36. The composition according to claim 23, wherein the at least one oxidation base of formula (I) is present in an amount ranging from 0.001% to 10% by weight, relative to the weight of the composition.
 37. The composition according to claim 36, wherein the at least one oxidation base of formula (I) is present in an amount ranging from 0.005% to 6% by weight, relative to the total weight of the composition.
 38. The composition according to claim 23, further comprising at least one coupler chosen from meta-phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene couplers, heterocyclic couplers and the addition salts thereof.
 39. The composition according to claim 23, further comprising at least one additional oxidation base chosen from para-phenylenediamines, bisphenylalkylenediamines, para-aminophenols, ortho-aminophenols, heterocyclic bases, and the addition salts thereof.
 40. The composition according to claim 23, further comprising at least one direct dye.
 41. A method for the oxidation dyeing of keratin fibers comprising, applying to the fibers at least one dyeing composition comprising, in a medium suitable for dyeing, at least one oxidation base chosen from compounds of the following formula (I) and the addition salts thereof:

wherein: R₁ is chosen from: a halogen atom; and linear and branched C₁-C₆ hydrocarbon chains, wherein the hydrocarbon chains may be saturated or may comprise at least one bond chosen from double bonds and triple bonds, the hydrocarbon chains may form at least one ring chosen from 3- to 6-membered rings, wherein at least one carbon atom can be replaced by at least one entity chosen from oxygen, nitrogen and sulphur atoms, and an SO₂ group, or, when the carbon is terminal, it may be replaced by a halogen atom; provided that the radical R₁ does not comprise a peroxide bond, a diazo radical, a nitro radical, or a nitroso radical; n is a number ranging from 0 to 4 inclusive, it being understood that when n is greater than or equal to 2, then the radicals R₁ may be identical or different; R₂ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated, unsubstituted and substituted with at least one radical chosen from carboxyl radicals, alkylcarbonyl radicals, alkoxycarbonyl radicals, carbamoyl radicals, mono- and dialkylcarbamoyl radicals, saturated and unsaturated, nitrogen- oxygen- and sulphur-comprising heterocyclic radicals comprising 4, 5, 6 or 7, identical or different, atoms; alkyl radicals which may be unsaturated, substituted at least at the 2-position by at least one radical chosen from hydroxyl radicals, alkoxy radicals, amino radicals, mono- and dialkylamino radicals, thiol radicals and halogen atoms; an alkylcarbonyl radical; an alkoxycarbonyl radical; a monoalkylcarbamoyl and dialkylcarbamoyl radical; a carbamoyl radical; and a radical R₆R₇N—C═NR₅— wherein R₅, R₆, and R₇, which may be identical or different, are each chosen from hydrogen, C₁-C₄ alkyl radicals and hydroxyalkyl radicals; R₃ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated; a hydroxyl radical; a hydroxyalkyl radical; an alkoxy radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an amino radical; a monoalkylamino and a dialkylamino radical; an aminoalkyl radical, it being possible for the amine to be mono- and disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; R₄ is chosen from: alkyl radicals which may be unsaturated; a hydroxyalkyl radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an aminoalkyl radical, wherein the amine may be mono- or disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; and m is a number ranging from 0 to 4 inclusive, it being understood that when m is greater than or equal to 2, then the radicals R₄ may be identical or different. and developing the color with the aid of at least one oxidizing agent.
 42. The method according to claim 41, wherein the at least one oxidizing agent is chosen from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts, peracids and oxidase enzymes.
 43. The method according to claim 41, wherein the at least one oxidizing agent is mixed at the time of use with the at least one dyeing composition.
 44. The method according to claim 41, wherein the at least one oxidizing agent is applied in the form of at least one oxidizing composition simultaneously to or sequentially with the at least one dyeing composition to the fibers.
 45. A multicompartment device or kit comprising, at least one first compartment comprising at least one dyeing composition comprising, in a medium suitable for dyeing, at least one oxidation base chosen from compounds of the following formula (I) and the addition salts thereof:

wherein: R₁ is chosen from: a halogen atom; and linear and branched C₁-C₆ hydrocarbon chains, wherein the hydrocarbon chains may be saturated or may comprise at least one bond chosen from double bonds and triple bonds, the hydrocarbon chains may form at least one ring chosen from 3- to 6-membered rings, wherein at least one carbon atom can be replaced by at least one entity chosen from oxygen, nitrogen and sulphur atoms, and an SO₂ group, or, when the carbon is terminal, it may be replaced by a halogen atom; provided that the radical R₁ does not comprise a peroxide bond, a diazo radical, a nitro radical, or a nitroso radical; n is a number ranging from 0 to 4 inclusive, it being understood that when n is greater than or equal to 2, then the radicals R₁ may be identical or different; R₂ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated, unsubstituted and substituted with at least one radical chosen from carboxyl radicals, alkylcarbonyl radicals, alkoxycarbonyl radicals, carbamoyl radicals, mono- and dialkylcarbamoyl radicals, saturated and unsaturated, nitrogen- oxygen- and sulphur-comprising heterocyclic radicals comprising 4, 5, 6 or 7, identical or different, atoms; alkyl radicals which may be unsaturated, substituted at least at the 2-position by at least one radical chosen from hydroxyl radicals, alkoxy radicals, amino radicals, mono- and dialkylamino radicals, thiol radicals and halogen atoms; an alkylcarbonyl radical; an alkoxycarbonyl radical; a monoalkylcarbamoyl and dialkylcarbamoyl radical; a carbamoyl radical; and a radical R₆R₇N—C═NR₅— wherein R₅, R₆, and R₇, which may be identical or different, are each chosen from hydrogen, C₁-C₄ alkyl radicals and hydroxyalkyl radicals; R₃ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated; a hydroxyl radical; a hydroxyalkyl radical; an alkoxy radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an amino radical; a monoalkylamino and a dialkylamino radical; an aminoalkyl radical, it being possible for the amine to be mono- and disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; R₄ is chosen from: alkyl radicals which may be unsaturated; a hydroxyalkyl radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an aminoalkyl radical, wherein the amine may be mono- or disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; and m is a number ranging from 0 to 4 inclusive, it being understood that when m is greater than or equal to 2, then the radicals R₄ may be identical or different and at least one second compartment comprising at least one oxidizing composition.
 46. A colored product obtained by oxidative condensation of at least one dyeing composition comprising, in a medium suitable for dyeing, at least one oxidation base chosen from compounds of the following formula (I) and the addition salts thereof:

wherein: R₁ is chosen from: a halogen atom; and linear and branched C₁-C₆ hydrocarbon chains, wherein the hydrocarbon chains may be saturated or may comprise at least one bond chosen from double bonds and triple bonds, the hydrocarbon chains may form at least one ring chosen from 3- to 6-membered rings, wherein at least one carbon atom can be replaced by at least one entity chosen from oxygen, nitrogen and sulphur atoms, and an SO₂ group, or, when the carbon is terminal, it may be replaced by a halogen atom; provided that the radical R₁ does not comprise a peroxide bond, a diazo radical, a nitro radical, or a nitroso radical; n is a number ranging from 0 to 4 inclusive, it being understood that when n is greater than or equal to 2, then the radicals R₁ may be identical or different; R₂ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated, unsubstituted and substituted with at least one radical chosen from carboxyl radicals, alkylcarbonyl radicals, alkoxycarbonyl radicals, carbamoyl radicals, mono- and dialkylcarbamoyl radicals, saturated and unsaturated, nitrogen- oxygen- and sulphur-comprising heterocyclic radicals comprising 4, 5, 6 or 7, identical or different, atoms; alkyl radicals which may be unsaturated, substituted at least at the 2-position by at least one radical chosen from hydroxyl radicals, alkoxy radicals, amino radicals, mono- and dialkylamino radicals, thiol radicals and halogen atoms; an alkylcarbonyl radical; an alkoxycarbonyl radical; a monoalkylcarbamoyl and dialkylcarbamoyl radical; a carbamoyl radical; and a radical R₆R₇N—C═NR₅— wherein R₅, R₆, and R₇, which may be identical or different, are each chosen from hydrogen, C₁-C₄ alkyl radicals and hydroxyalkyl radicals; R₃ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated; a hydroxyl radical; a hydroxyalkyl radical; an alkoxy radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an amino radical; a monoalkylamino and a dialkylamino radical; an aminoalkyl radical, it being possible for the amine to be mono- and disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; R₄ is chosen from: alkyl radicals which may be unsaturated; a hydroxyalkyl radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an aminoalkyl radical, wherein the amine may be mono- or disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; and m is a number ranging from 0 to 4 inclusive, it being understood that when m is greater than or equal to 2, then the radicals R₄ may be identical or different.
 47. A para-phenylenediamine derivative of formula (I) and the addition salts thereof:

wherein: R₁ is chosen from: a halogen atom; and linear and branched C₁-C₆ hydrocarbon chains, wherein the hydrocarbon chains may be saturated or may comprise at least one bond chosen from double bonds and triple bonds, the hydrocarbon chains may form at least one ring chosen from 3- to 6-membered rings, wherein at least one carbon atom can be replaced by at least one entity chosen from oxygen, nitrogen and sulphur atoms, and an SO₂ group, or, when the carbon is terminal, it may be replaced by a halogen atom; provided that the radical R₁ does not comprise a peroxide bond, a diazo radical, a nitro radical, or a nitroso radical; n is a number ranging from 0 to 4 inclusive, it being understood that when n is greater than or equal to 2, then the radicals R₁ may be identical or different; R₂ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated, unsubstituted and substituted with at least one radical chosen from carboxyl radicals, alkylcarbonyl radicals, alkoxycarbonyl radicals, carbamoyl radicals, mono- and dialkylcarbamoyl radicals, saturated and unsaturated, nitrogen- oxygen- and sulphur-comprising heterocyclic radicals comprising 4, 5, 6 or 7, identical or different, atoms; alkyl radicals which may be unsaturated, substituted at least at the 2-position by at least one radical chosen from hydroxyl radicals, alkoxy radicals, amino radicals, mono- and dialkylamino radicals, thiol radicals and halogen atoms; an alkylcarbonyl radical; an alkoxycarbonyl radical; a monoalkylcarbamoyl and dialkylcarbamoyl radical; a carbamoyl radical; and a radical R₆R₇N—C═NR₅— wherein R₅, R₆, and R₇, which may be identical or different, are each chosen from hydrogen, C₁-C₄ alkyl radicals and hydroxyalkyl radicals; R₃ is chosen from: a hydrogen atom; alkyl radicals which may be unsaturated; a hydroxyl radical; a hydroxyalkyl radical; an alkoxy radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an amino radical; a monoalkylamino and a dialkylamino radical; an aminoalkyl radical, it being possible for the amine to be mono- and disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; R₄ is chosen from: alkyl radicals which may be unsaturated; a hydroxyalkyl radical; an alkoxyalkyl radical; an alkylcarbonyl radical; a hydroxyalkoxyalkyl radical; an aminoalkyl radical, wherein the amine may be mono- or disubstituted with at least one identical or different radical chosen from alkyl, acetyl and hydroxyalkyl radicals; a hydroxy- and aminoalkyl radical; a carboxyl radical; a carboxyalkyl radical; a carbamoyl radical; a carbamoylalkyl radical; an alkoxycarbonyl radical; and a monoalkylaminocarbonyl and a dialkylaminocarbonyl radical; and m is a number ranging from 0 to 4 inclusive, it being understood that when m is greater than or equal to 2, then the radicals R₄ may be identical or different, wherein said para-phenylenediamine derivative is not 4-(4-methyl-[1,4]diazepan-1-yl)phenylamine, 4-(4-methyl-1,4-diazacycloheptan-1-yl)aniline, 3-cyano-4-(4-t-butoxycarbonyl-1,4-cyclodiazacycloheptane)aniline, 4-(4-butoxycarbonyl-1,4-diazacycloheptane)aniline. 